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Walmart continues to offer the 3M Filtrete Allergen Defense HVAC Filter 3-Pack for $15.88. Opt for in-store pickup to dodge the $5.99 shipping fee. That's $11 off and tied with last week's mention as the lowest price we could find. Buy Now Features 800 MPR last up to three months select sizes from 12" x 24" x 1" to 20" x 30" x 1" Model: 821-3PK-BFG